More importantly, they serve as a larger mounting platform for active defensive systems like the Gun Turrets and Missile Turrets. These systems improve your defensive forces ability to repel enemy attacks.

You can build 4 Gates in total, and they can only be installed along the grey perimeter line surrounding your Sector.

The more of these buildings you have in and around your Sector, the higher your Troops' defensive index is.

Detectors, Reflectors, Wires, and Barriers of various types can be installed on both on your perimeter Walls, Gates, Towers - and on the grounds inside your Sector. To build Detectors, Reflectors, Wires and Barriers:1. Go to your Sector. 2. Click the "Construction" button.3. Open the "Improvements" tab, then open the "Miscelaneous" tab and select the object you want. 4. Select an area and start building.

The more of these buildings you have in and around your Sector, the higher your Troops' defensive index is.

Aside from your Detectors, Reflectors, Wires, and Barriers there are miscellaneous Improvements that can only be installed within the grounds inside your Sector. These include Roads, Lights, Barrels, and U-Tanks. Improvements fall under several categories: - Holiday; - Military (including Elite Sector Security Units that do not need Credits for maintenance but stay only in the confines of the Sector); - Flags (they add to your Sector Defense Bonus); - Miscellaneous (apart from Detectors, Reflectors, Wires, and Barriers, here you can purchase Mutagen Barrels that add mutagen for creating Cyborgs).